If you own an RV in Wisconsin, you already know the off-season can be rough on equipment. Long stretches of freezing temps, snow, slush, and big temperature swings are exactly what turn “park it and forget it” into cracked plumbing, dead batteries, mildew, and springtime repair bills. The good news: a thorough storage routine once a year can keep your rig protected, clean, and ready to roll when camping season returns. Here’s a practical, Wisconsin-friendly checklist you can follow.
1) Choose the right storage setup first
Before you touch a wrench, decide where the RV will live for the season. Your prep steps change depending on whether you’re storing outdoors, under a canopy, or inside. Outdoor storage requires more attention to moisture control, tires, and UV protection. Indoor storage reduces weather exposure but still needs pest prevention and battery care. Many owners look for a secure storage facility with controlled access, good lighting, and enough room to maneuver especially if you’ll be dropping off a larger trailer or motorhome.
2) Wash, de-grime, and dry (seriously)
Start with a full exterior wash, including the roof if it’s safe to access. Road salt and grime left sitting for months can stain finishes and corrode metal. Once it’s clean, let everything dry completely. Inside, do a deep clean: vacuum, wipe surfaces, and don’t forget the fridge, microwave, pantry, and every cabinet. Any crumbs or lingering odors are basically a winter invitation for mice.
Pro move: leave interior doors, drawers, and the fridge cracked open (once it’s cleaned and dry) to reduce musty smells and trapped moisture.
3) Winterize the plumbing system (the most important step in Wisconsin)
Freeze damage is one of the biggest storage killers in northern climates. The core goal is to remove water from the system and protect what can’t be fully drained. In most cases, that means draining the fresh/gray/black tanks, emptying the water heater, opening low-point drains, and then running non-toxic RV/marine antifreeze through lines and traps (or using compressed air, depending on your method).
Don’t forget:
- Remove or bypass water filters (filters can crack if frozen).
- Protect P-traps (sinks/shower) with antifreeze.
- Flush the toilet valve with antifreeze.
- Confirm the water heater is drained and bypassed before pumping antifreeze.
If you’re not 100% comfortable doing this yourself, many RV service shops in Wisconsin offer winterization packages and it’s often worth it for peace of mind.
4) Manage moisture to prevent mold and odors
Wisconsin winters can trap humidity inside a closed RV. After cleaning, place moisture absorbers (like desiccant tubs) in a few areas especially near the bathroom and kitchen. Consider breathable seat covers and keep fabrics dry. If your RV has roof vents, vent covers can allow a little airflow while still keeping snow and rain out.
5) Protect against pests (because they will try)
Rodents love warm, quiet winter homes. Focus on exclusion first:
- Seal small gaps around plumbing or wiring entry points (use steel wool + foam, or appropriate sealant).
- Close exterior access doors securely.
- Remove all food yes, even “sealed” snacks.
Then use deterrents: traps (set safely), peppermint oil products, or commercial rodent repellents. Also check your undercarriage and engine bay (for motorhomes) before you lock up.
6) Battery, electrical, and propane basics
Batteries hate sitting discharged in cold weather. If possible, remove house batteries and store them in a cool, dry place where they won’t freeze, keeping them on a proper maintainer/charger. If removal isn’t practical, disconnect them and maintain charge periodically.
Turn off propane at the tank. If you store indoors, confirm the facility’s propane rules (many require propane valves off).
7) Tires, leveling, and flat-spot prevention
Inflate tires to the manufacturer’s recommended storage/operating pressure. If you’ll be parked for months, use tire covers (UV protection still matters even in winter) and consider leveling blocks or pads under tires to keep them off wet ground. Some owners use jack stands to reduce load, but follow your RV manufacturer’s guidance for safe support.
8) Fuel, engine, and “ready-to-start” steps (motorhomes)
If you have a motorhome or generator:
- Top off fuel and add a stabilizer, then run the engine/generator long enough to circulate treated fuel.
- Change oil if you’re close to the service interval (dirty oil sitting all winter isn’t ideal).
- Check coolant strength for cold temps and ensure proper protection.
9) Cover it the right way
A good RV cover should be breathable and sized properly. Avoid tarps that trap moisture and rub paint. Protect key seals (slides, roof penetrations, windows) by inspecting and conditioning them before storage.
10) Pick a storage partner you can trust
Where you store matters almost as much as how you prep. For many Wisconsin owners, Apple Mini Storage is a go-to option thanks to its Wisconsin presence and storage features designed to make long-term parking and access straightforward. Their facilities emphasize secure, convenient storage solutions across the state, and many locations offer options that work well for seasonal needs.
If you’re comparing facilities, look for:
- Secure gated access and good lighting
- Enough space to back in and park confidently
- Clear policies for RVs/vehicles and winter access
- A team that can help you choose the right space
Final checklist before you walk away
- Take photos of your RV condition and note any existing issues
- Remove valuables and important documents
- Confirm locks, hitch coupler lock (trailers), and wheel locks if desired
- Leave a “spring startup” note to yourself (what you winterized, what you removed, where you stored batteries, etc.)
With a solid routine and a reliable storage location your RV can come out of a Wisconsin winter in the same condition it went in: clean, protected, and ready for the first warm weekend.
FAQ
1. Do I really need to winterize my RV in Wisconsin?
Yes. Wisconsin winters regularly drop well below freezing, which can cause water lines, tanks, and fittings to crack if not properly winterized. Even a single freeze can result in costly plumbing repairs. Proper winterization protects your RV’s water system from freeze damage.
2. Should I store my RV indoors or outdoors during winter?
Indoor storage offers the best protection from snow, ice, UV exposure, and moisture buildup. However, outdoor storage can work well if you properly winterize, cover the RV with a breathable cover, and take extra moisture and pest prevention measures. Many RV owners choose facilities like Apple Mini Storage for secure and convenient long-term storage options throughout Wisconsin.
3. How do I keep mice and rodents out of my RV?
Start by sealing small openings around pipes and wiring with steel wool or foam sealant. Remove all food, clean thoroughly, and use rodent deterrents or traps as a precaution. Regularly inspect your RV during storage if possible.
4. Do I need to remove my RV battery for storage?
It’s highly recommended in cold climates. Batteries can lose charge quickly in freezing temperatures and may be damaged if they fully discharge. Store batteries in a cool, dry place and use a battery maintainer to keep them charged throughout the winter.
5. What type of antifreeze should I use when winterizing?
Use only non-toxic RV/marine antifreeze (usually pink in color). Never use automotive antifreeze in your RV plumbing system, as it is toxic and unsafe for freshwater systems.
6. How do I prevent mold and mildew during long-term storage?
Clean and completely dry the RV before storage. Leave cabinet doors slightly open, prop the refrigerator open, and use moisture absorbers or dehumidifier products inside. Proper ventilation and moisture control are key to preventing musty odors.
7. Should I cover my RV during storage?
Yes, especially for outdoor storage. Use a breathable RV-specific cover that fits properly. Avoid plastic tarps, as they can trap moisture and cause mold, mildew, or paint damage.
8. What should I do with the propane tanks?
Turn off the propane at the tank before storage. Some indoor storage facilities require propane valves to be closed. Always check your storage provider’s policies to ensure compliance.
9. How do I protect my RV tires during long-term storage?
Inflate tires to the recommended pressure and use tire covers to protect them from UV exposure. If storing outdoors, place tires on leveling blocks rather than directly on wet ground to prevent moisture damage and flat spots.
10. When should I start preparing my RV for winter storage?
Ideally, winterization should be completed before the first hard freeze—typically in late fall in Wisconsin (October or early November). Preparing early prevents unexpected cold snaps from causing damage.